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Long-Term Debt (Credit Agreement) (Details) - USD ($)
Jun. 04, 2018
Oct. 11, 2018
Sep. 30, 2018
Dec. 31, 2017
Credit Agreement | Term loan        
Debt Instrument [Line Items]        
Long-term line of credit $ 1,300,000,000      
Maximum borrowing capacity     $ 50,000,000.0  
Early termination penalty 1.00%      
7.75% senior notes        
Debt Instrument [Line Items]        
Interest rate     7.75% 7.75%
Successor Company | Term loan        
Debt Instrument [Line Items]        
Amortization of outstanding loan principal amount, quarterly installment 0.25%      
Successor Company | Credit Agreement | Term loan        
Debt Instrument [Line Items]        
Interest rate 6.58%      
Basis spread on variable rate 1.00%      
Successor Company | Alternative Base Rate | Credit Agreement | Term loan        
Debt Instrument [Line Items]        
Basis spread on variable rate 3.50%      
Successor Company | London Interbank Offered Rate | Credit Agreement | Term loan        
Debt Instrument [Line Items]        
Basis spread on variable rate 4.50%      
Successor Company | Federal Funds Rate | Credit Agreement | Term loan        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.50%      
Successor Company | Minimum | Alternative Base Rate | Credit Agreement | Term loan        
Debt Instrument [Line Items]        
Basis spread on variable rate 2.00%      
Successor Company | Minimum | London Interbank Offered Rate | Credit Agreement | Term loan        
Debt Instrument [Line Items]        
Interest rate 1.00%      
Subsequent Event | Credit Agreement | Term loan        
Debt Instrument [Line Items]        
Debt face amount   $ 50,200,000.0    
Debt net of discount   $ 50,000,000    
Par value discount rate   0.40%